Changes in Properties of Clay Surrounding Cast in situ Piles |
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Authors: | G S Ghataora L Lee U K Ling |
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Institution: | (1) University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom;(2) Previously of the University of Birmingham, Birmingham, United Kingdom |
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Abstract: | Often pile load carrying capacity is derived from friction between pile and the surrounding soil. This magnitude of friction
mobilised, in the main, depends on pile material, properties of the soil and method of construction. In terms of construction,
piles may be either pre-formed or cast in situ. Cast in situ piles are formed by boring a hole and filling it with concrete.
It is envisaged that water and both calcium and hydroxyl ions migrate from the fresh concrete to the surrounding soil and
have an impact on soil properties. An experimental study was undertaken to examine the extent of soil (Oxford clay) around
the pile was affected by fresh concrete. Time related study included load tests on model piles. The investigation showed that
there was about 4% increase in the moisture content of the surrounding soil soon after fresh concrete was placed and with
time this dissipated. It showed that there was an increase in both hydroxyl and calcium ions in the vicinity of the pile.
These also affected the adhesion factor, which increased with time to a limiting value. Time related tests showed that there
was a small increase in pile load capacity with time. |
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Keywords: | |
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